Valve mechanism forinternal-combustion engines



C. W. PRADEAU. VALVE MECHANISM FOR lNTERNAL COMBUSTION ENGINES.

APPLICATION FILED rams, 1921.

3,998, I Patented July 5, 1921.

v mimw w r a s 1 z M lb PM i it I o CHARLES VJELLIAIVI Application filed February 8, 1921.

1 '0 all whom it may concern: w

Be it known that T, Ci u ns. t Vinnnmi ,niand, have invented c rtain new -Combwtion Engines, for which T application in Great Britain, Feb.

. I atent No. 151,89d; and T do hereby 10 declare that the following is a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to valve mechanism for internal ombustion engines of the class employing reciprocating valves such as p is ton or sleeve valves connected to a rocking member adapted to be operated from a cam. 1e objects of the invention consist in an 'oved mechanism for operating the -ves, which will be more silent in operation than the mechanism as at present constructed, d a more simplified construction, emclo, in very few parts, which are not likely to get-out of order. A further advantage of the apparatus consists in reducing the moving or rotating parts requiring lubrication to a minimum thus reducing wear. A further feature of the invention consists in an i'n'orcved a ngement of the parts of the engine wl enables all machining operations usually quired on the cylinder or C ll11(l3i" block i the course of manufacture, he eiiected in less time and with less labor th n hitherto.

ordinp; to the general principle of my the valves controlling the inlet nerts are each mounted at one citing or floating member adapted ed directly by a cam mounted on a shaft or if necessary on separate which shaft or shafts is or are adapt o d iven by any suitable mechanism or .5 .irin :rcm the crank shaft. The f w st members which constitute one of the es of the invention each conformed with suitable bearings to eceivea roller adapted to be on, IECl by and cceperete with the cam on thecam shaft. The fitting is connected at one end a coi snring' or springs which are mounted in such a manner as to normally press the rocking member toward the open sting cam. The rocking member is further mounted so that the point or fulcrum about which it rocks coincides with or approxi- FE A3111,

Specification of Letters Eatent.

il l'mprovements in Valve liilcCllELlllSIIl for 15), 0F. LONDUN, ENGLAND.

EEILkL-O'OMBUSTEON ENGINES.

Patented July 5, 1 .9211.

Serial No. 443,447.

mately coincides with the center of the coils of the spring.

The opposite end of the rocking member is preferably rigidly fixed to a second spring or springs which are also connected to the valve.

In order that the invention may be readily understood reference is made to the accompanying drawings in which Figure 1 is a vertical section, and,

Fig. 2 is plan view of the upper portion of the cylinder of a four stroke cycle internal combustion engine.

The cylinder c is preferably provided with a removable cylinder head 7) which is preferably formed, with inlet and exhaust valve chambers, said inlet valve chambers being indicated at 0, and the exhaust valve chambers being not here shown. These valve chambers may be arranged on one side of the cylinder as shown in the drawing or they may be arranged. on opposite sides, at th top or in any other suitable position, as desired.

The top of the cylinder head has secured thereto or formed therewith preferably two brackets or arms 6, c, which form bearings for a horizontal cam shaft 7" on which are rigidly mounted cams r]. The cam shaft f is driven by any suitable mechanism or gearfrom the'crank shaft (not shown) the geari ,2 being arranged in a suitable ratio accor if}; to the type of engine to which the The lower face 0 of the valve chamber 0 is connected in any suitable manner to a source iply of explosive mixture while the cori i'ionding lower surface of the exhaust l c chamber which is not seen in the drawingnis connected to the usual exhaust.

lflounted above'the cylinder head 7) is a pair of rocking members each comprising a fittin Z to one end of which is rigidly connected one end of coil spring or springs m, the opposite ends of which are adapted to be secured to a bracket 11. on the side of the cylinder head. In the drawings, l have shown two coiled springs arranged side by side, but it will be readily understood that these springs may be replaced by a single spring or by a plurality of springs. The bracket n for securing the outer ends of the springs m preferably Consists of a flat projecting portionn formed with vertically disposed V grooves or semi-circular chan- Qnels or slots, which cooperate with a plate or the like 71 similarly slotted or channeled.

Theends of thesprings are adapted to engage in the slots and when the plate n is bolted in position, the springs will be securely gripped. 7

The opposite end of the'fitting Z is connected in a similar manner to one end of a pair of springs 10 (which'may also be replaced by asingle spring or a plurality of springs) the opposite ends of which are gripped between a pairof plates 19, p bolted together, one. oi. said plates p] being formed with or attached to thetop of the piston valves h at h-.- 1 7 Each of the fittingsil is provided with recess or aperture Z in which ispivotally mounted a 'cam roller, 9, said cam roller being adapted to cooperate with the cams g.

' The ends of the fitting are preferably slotted while the inner ends of the springs. are adapted to engage said slots, the ends ofthe fitting being forced together to grip the ends of the; springs by bolts 0. V

It will be understood hat the cams g are mounted relatively to one another, so as to. cause the'rocklng member to be rocked to place the respective valve chambers into communication with the cylinders at appropriate times.

The operation is asfollowsi- 35 The cam rollers g are normally pressed into contact with the cams gbythe springs m, and as the cam rotates'the'roeking mem her will be rocked abouta point which approximately coincides with the center m of the spring m, thus alternately raising and lowering the piston valves. When the rock ing. -member moves upwardly the coil springs mhave a, tendency to open out or extend whereby the fitting will be moved to the left to a very small extent, while the spring 0 connected .to the opposite end of the fitting Z and the corresponding piston valve has a tendency to close, or its ends to movetoward one another, so that the lateral 50.

movement of the fitting is thereby taken up. By this means very silent and quicklyop crating movement is obtained, while at the same time the number of parts employedis considerably reduced. Further the only parts I requiring lubrication are the "piston valves and the cam rollers 9 so that the tendencyto wear or to get out of order reduced to aminimum;

It will bereadily understood that the details of construction may be modified con; siderably, without departingfrom the principle of the invention. For instance the valvesmay bearranged in any other pos tion and-move in any other direction than that shown. Further the camTShaft f, may if necessary,.be arranged below the rocking members in which case the springs m and 0 would be arranged to exert pressure in the floating member and said'valve in the re verse direction.

a 2. Incombinationwith a cylinder and a valve of an internal combustion engine a floating member, a spring. connecting .the sa1d member to the cylinder, a secondsp'r ng I connecting the said member to the valve,

the first named spring serving to move the, floating member and the valve 1n one (11160 tlon, and a positively driven cam to move said floating member and said valve in the 7 reverse direction.

"3.:In combination with a cylinder and a valve of an internal combustion engine, a

floating member, a" spring connectingsaid floating member to the cylinder, sa1d spr ng including a coil at'a pointiintermediateits"? ends serving to form a fulcrum for said fioatlng' member and to also move sa1d floating memberi'in one direction, a second spring connectlng sa1d floatmg'member to the p1ston, and positively driven means to move 1.

said floating member in the reverse 'direc-' non. r 4; In combination. with acylinder and a valve of an internallcombustionengine, a i

floating member; a roller carried byisaid I floating member, a spring to move said floating member: in one direction, said spring also connecting sa d float ng member to the cylinder, a second. spring connecting the floating member to thewalve, .and a revoluble cam coacting with said roller to move the floating member in the reverse direction. I

. ,VOHARLESY WI L A PniinEAu; 

